SoLDMResourceParameters.TileCachePolicies Enumeration

SoLDMResourceParametersTileCachePolicies Enumeration

Tile cache management policy (see the Memory Management section above for more information).

Namespace: OIV.LDM.Nodes
Assembly: OIV.LDM (in OIV.LDM.dll) Version: 10.12.3.0 (10.12.3.0)

Syntax

public enum TileCachePolicies

Public Enumeration TileCachePolicies

public enum class TileCachePolicies

type TileCachePolicies

Members

Member name	Value	Description
NONE	0	For non-tiled data like DICOM or SEGY or an in-memory volume, tiles are created when needed (to send data to the GPU) and all tiles (both low resolution and full resolution) are stored in the BufferObject cache. The CPU tile cache is not used. If the entire volume fits in GPU memory, then tiles will only be created once, otherwise performance is affected because some time is required when tiles need to be re-created and are not in the BufferObject cache. For tiled data that is compressed (e.g. an LDM file created with compression), the compressed tiles are stored in the CPU tile cache "as is" to reduce the memory requirement. Uncompressed tiles are created from the compressed data when needed (to send data to the GPU) and are stored in the BufferObject cache. This mode saves memory but can reduce interactivity.
LOWRES_ONLY	1	For non-tiled data like DICOM or SEGY or in-memory volume, tiles are created when needed (to send data to the GPU), but low resolution tiles are stored in the CPU tile cache and full resolution tiles are stored in the BufferObject cache. For tiled data that is compressed (e.g. an LDM file created with compression), low resolution tiles are uncompressed when loaded and stored uncompressed in the CPU tile cache. Full resolution tiles are stored compressed in the CPU tile cache (to reduce the CPU memory requirement). Uncompressed tiles are created from the compressed data when needed (to send data to the GPU) and are stored in the BufferObject cache. This setting uses more memory but saves time when low resolution tiles need to be sent to the GPU.
ALL	2	For non-tiled data like DICOM or SEGY or in-memory volume, tiles are created when needed (to send data to the GPU) and all tiles (both low resolution and full resolution) are stored in the CPU tile cache. This mode is recommended for non-tiled volumes loaded from disk when the volume will fit in memory (generally true for medical volumes). NOTE: For an in-memory volume, this setting will duplicate the data in memory. For an in-memory volume it is better to use the LOWRES_ONLY or NONE setting. For tiled data that is compressed (e.g. an LDM file created with compression), all tiles are uncompressed when loaded and stored uncompressed in the CPU tile cache. This setting uses the most memory, but saves time when tiles need to be sent to the GPU. The BufferObject cache is not used.

Member name

Value

Description

NONE

For non-tiled data like DICOM or SEGY or an in-memory volume, tiles are created when needed (to send data to the GPU) and all tiles (both low resolution and full resolution) are stored in the BufferObject cache.

The CPU tile cache is not used. If the entire volume fits in GPU memory, then tiles will only be created once, otherwise performance is affected because some time is required when tiles need to be re-created and are not in the BufferObject cache.

For tiled data that is compressed (e.g. an LDM file created with compression), the compressed tiles are stored in the CPU tile cache "as is" to reduce the memory requirement. Uncompressed tiles are created from the compressed data when needed (to send data to the GPU) and are stored in the BufferObject cache.

This mode saves memory but can reduce interactivity.

LOWRES_ONLY

For non-tiled data like DICOM or SEGY or in-memory volume, tiles are created when needed (to send data to the GPU), but low resolution tiles are stored in the CPU tile cache and full resolution tiles are stored in the BufferObject cache.

For tiled data that is compressed (e.g. an LDM file created with compression), low resolution tiles are uncompressed when loaded and stored uncompressed in the CPU tile cache. Full resolution tiles are stored compressed in the CPU tile cache (to reduce the CPU memory requirement). Uncompressed tiles are created from the compressed data when needed (to send data to the GPU) and are stored in the BufferObject cache.

This setting uses more memory but saves time when low resolution tiles need to be sent to the GPU.

ALL

For non-tiled data like DICOM or SEGY or in-memory volume, tiles are created when needed (to send data to the GPU) and all tiles (both low resolution and full resolution) are stored in the CPU tile cache.

This mode is recommended for non-tiled volumes loaded from disk when the volume will fit in memory (generally true for medical volumes). NOTE: For an in-memory volume, this setting will duplicate the data in memory. For an in-memory volume it is better to use the LOWRES_ONLY or NONE setting.

For tiled data that is compressed (e.g. an LDM file created with compression), all tiles are uncompressed when loaded and stored uncompressed in the CPU tile cache.

This setting uses the most memory, but saves time when tiles need to be sent to the GPU. The BufferObject cache is not used.

Remarks

Used by OIV.LDM.Nodes.SoLDMResourceParameters.tileCachePolicy.

For tiled data that is not compressed (e.g. a standard LDM format file), the TileCacheType setting has no effect and only the CPU tile cache is used.

Setting the OIV.Inventor.SoPreferences variable LDM_USE_IN_MEM_COMPRESSION to false (zero) effectively sets the tile cache type to mode ALL.

Reference

OIV.LDM.Nodes Namespace